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Finding the Fourth Proportional to 143,287.80, 214,931.70 and 128,525.55

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Solution

The fourth proportional to 143,287.80, 214,931.70 and 128,525.55 is: 192,788.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,287.80 : 214,931.70 = 128,525.55 : x
  2. Step 2: Convert to fraction form
    143,287.80/214,931.70 = 128,525.55/x
  3. Step 3: Cross multiply
    143,287.80x = 214,931.70 × 128,525.55
  4. Step 4: Simplify right side
    143,287.80x = 27,624,214,954.94
  5. Step 5: Solve for x
    x = 27,624,214,954.94/143,287.80
  6. Step 6: Final answer
    x = 192,788.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.